Sharpener for disk harrows



2 c. c. HUFF SHARPENER FOR DISK HARROWS' Filed April 25, 1928 PatentedOct. 15, 1929 UNITED STATES CHARLES C. HUIEF, OF CLARKS, NEBRASKASHARPENER FOB, DISK I-IARROWS Application filed April 25,

This invention relates to sharpeners for disk harrows, and constitutesan improvement upon the subject matter of my Patent Number 1,443,132,issued to me under date of January 23, 1923. The object of the inventionis to simplify and otherwise improve the structure described in the saidpatent, and so as to provide a practical and efficient tool for thesharpening of the disks of such harrows.

In the drawing Figure 1 is a side elevation of the device as operativelymounted upon the disk of a disk harrow, a portion of the disk beingbroken away;

Figure 2 is a view on the line 22 of Fig ure 1, the disk being shownpartly in section and partly broken away;

Figure 3 is an enlarged detail in plan of the 20 rod carriers;

Figure 4 is an enlarged detail of the anvil and a portion of the anvillever formed integrally therewith;

Figure 5 is an enlarged detail in elevation 2 of the upper portions ofthe anvil and sharpener levers, the connecting adjustment screw with theadjustment wheel in reversed position as required for truing up the edgeof the disk and the retaining spring, the upper ex 30 tremity of theanvil lever being shown in section.

The invention comprises a frame made up of two pairs of rods, a pair ofpush rods 1 made by bending a length of rod upon itself, with the bight2 thereof curved inwardly and so adapted to seat upon the hub 3 of thedisk 4L, at the convex side of the disk, and a pair of draw rods 5,having the bight 6 thereof inset at 7 and curved outwardly and soadapted to pass underneath the axle 8 of the harrow 9, at the concaveside of the disk. The lowerportions of the pair of rods 5 are passedthrough a supporting block 10. Owing to the greater diameter of the hub3 over the axle 8, the rods 1 are spaced farther apart than the rods 5.Two rod carriers 11 having rod engaging apertures 12 through theirextremities and adjustably connected in spaced relation by means of anadjustment or set screw 13, are

. slidably mounted over the upper free ends of 1928. Serial No. 272,668.

the rods land 5, two of the extremities of the carriers 11 being turnedoutwardly at It for this purpose. Two set screws 15 passed into twoof'the apertures 12 afford means for look ing the carriers in anyadjusted position upon the rods 1 and 5. Curved anvil and sharpenerlevers 16 and 17 are mounted between the carriers 11 and are pivotallyconnected by means of a pin 18 passed through the forked extremity ofthe sharpener lever 17 set astraddle the anvil lever 16 at a lowermedial point, and through the said medial point of the anvil lever. Thelower and inwardly turned extremity of the said anvil lever carries theintegrally formed anvil block 19.

The sharpener lever 17 is slotted at 20 and the screw 13 is passedthrough that slot, whereby the levers are adjustably supported inoperative position. The upper extremity of the sharpener lever 17 isformed as shown at 21 and an adjustment screw 22 is hingedly mounted byone end within said forked end by means of a pin 23,. the opposite endof the screw being passed loosely through the upper extremity 27 of theopposed anvil lever 16. An adjustment wheel 24 having an oti'set hub 25is mounted upon the screw 22 inthreaded engagement therewith. Anexpanding coil spring 26 is mounted over the screw 22 and braced betweenthewheel 24 and the extrem ity 27 of the lever 16. A retaining spring.28 is stretched between the points 29 and 30 of the levers 16 and 17,thereby tending to draw together the upper ends of the said levers. Adownwardly extending'offset 31 from the lever 17 is apertured out toform a tool receiving recess 32 into which a grinding tool 33isreleasably secured by means of the set screw 3-1. This tool 33 is tobe directly aligned with the anvil block 19, and the two are adapted tomeet at an angle of inclination from a perpendicular line drawn to theaxle 8, corresponding to the inclination of the periphery 35 of the disk4, to the end that the edge of the disk 4: may be thereby engaged by thetool 33 in just the right way to be rightly sharpened when the said diskis rotated as when being used in the field.

The upper end of the frame as a whole, so formed, may be sustained inoperative position upon the harrow 9 and relative to the disk I 4 bymeans of a bracket 36 extended from the said harrow and provided withholes 37 through which two of the rods 1 and 5 are 5 passed.

In use, the device as described is positioned upon the harrow in themanner described, with the edge of the disk to be sharpened placedbetween the anvil 19 and the tool 33, which adjustment may be readilymade by proper manipulation of the wheel 24 and of the lever 17 throughthe slot 20. Rotation of the disk 4, either by hand or by drawing theharrow over the ground, then results in a sharpening action of the tool33 upon the edge of the disk. It the disk has an untrue edge, the edgemay be trued by merely reversing the wheel 24: upon the screw 22, asshown in Figure 5, and bringing the wheel hub 25 to bear directlyagainst the upper end of the lever 16, thereby holding the anvil 19firmly against the edge 35 of the disk 4, and then revolving the saiddisk as before. This arrangement will cut oil all inequalities of theedge of the disk.

It is understood that I may make any desired minor changes in thestructure here shown, not departing from the spirit of my invention asdefined in the appended claim.

I claim:

A sharpener for disk harrows, comprising a frame made up of a pair ofpush rods adapted to seat upon the hub of a disk at the convex sidethereof and a pair of draw rods adapted for a bearing underneath theaxle of the harrow at the concave side of the said disk, two rodcarriers slidably mounted one each upon one of the said push rods andone of the said draw rods, the'said rod carriers being 40 adjustablyconnected with an adjustment screw, an anvil lever and a sharpener levermounted between the said rod carriers, the said levers being pivotallyconnected, the lower end of the anvil lever carrying an anvil blockadapted for positioning laterally at the edge of the disk upon theconcave side thereof and the lower offset end or" the sharpener leverhaving means "for adjustably supporting a sharpener tool at the edge ofthe disk upon the convex side thereof and oppositely to the said anvilblock, a sharpening stone mounted in the said supporting means at thelower end of the sharpener lever, and means upon the said levers forbringing varying degrees of pressure upon the said levers for forcingthe anvil block and sharpening tool together. In testimony whereof Iaffix my signature.

CHARLES o. HUFF.

